Radial drill



Aug. 9 1927- J, c. CARLTON RADIAL DRILL 12 sheets-sheet 3 Filed March 12. 1924 Aug. 9, 1927.

J. C. CARLTON RADIAL .DRILL Filed March 12. 1924 12 Sheets-Sheet 4 Aug. 9, v 1927;

J. c. CARLTON RADIAL DRILL F'iied March 12. '1924 12 sheets-sheet 5 319,07. /laf a I "4 Lipu' fpl 's 51g .i 9/ V .asis Il 'o' o i I41.9 a 1 ,L .y

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J. Lc. cRL'roN RADIAL DRILL Filed Mrh 12. `1924 '12 sheets-sheet 6 I g J. c. CARLTON RADIAL DRILL Filed March 12, 1924 12 Sheets- Sheet 8 WilIlllillllllliHillI IIIII'IIIIIIIIIIIIII n J Aug. 9,1927.

J. c. CARLTON'.

- RADIAL DRILL Filed March 12. 1924l 12 sheets-snaai 1o Aug. 9, 1927. 1,638,654

J. c. GARLTQN RADIAL DRILL Filed March 12. 1924 12 Sheets-Sheet 11 Aub 9 192.7' J. c. CARLTON RADIAL DRILL Filed March 12. 1924 12 Smets-sheet 12 Patented'Aug. 9, 19h27.'

' UNITED STATES',

lPATENT-lf"oll-lcn d'ACK G. CARLTON, 0F CINCINNATI, OHIO, ASSIGNOR TO THE` CARLTON MACHINE Toon conrAnY, or crNcINNATI,

OHIO, A CORPORATION OE OHIO.

RADIAL DRILL.

l Application filed March 12, 1924. Serial No. $98,686.@

This invention relates generally to radial rilling'machines, and is particularly directed to improvements in head construction, including improvements in the. mount- 6' ing of and `'application of power to the spindle, mechanism for controlling rotative .speed of the spindle, and. mechanism' for,

feeding or translating the spindle, as well as features of the general construction. The l mechanism of the he`ad includes improved means for feeding or translating the spindle at varying rates of speed, both in forward and reverse directions, as well as improved means for rotating the spindle at varying l rates of speed. The transmission and reversing mechanisms are placed, in this instance, at the rear .of the rail, and the spindle and various other mechanisms re-n lated thereto, at the front of and beneath the rail.

An object of the invention is to provide an. improved clutch, and mechanism for con# trollin and operating the spindle, the same being interposed between and transmitting` 26 ly connected with gears of the spindle translating transmission gear train, whereby spindle translationcan be discontinued during spindle rotation.

Another object is to provide improved 30 means, manually operable, for effecting en-g gage'ment of the clutch, and automatically "operable for disengaging theclutch at lim-v its of; translation in either direction, said means being in the nature of a safety device S5 to 'prevent over-translationof the spindle.

' Another 'object of the invention is to provide means for vadjusting the clutch elements to take up for wear between the same, said means including elements for adjusting 40 the thrust receiving members relative to one another. .1

Another object is to provide improved means, automatically operable, for disen aging the clutch, to discontinue spindle eed at any point between its translative limits, 'to prevent over-feed and consequent injury to machine, tool or work.

Otherl features are an improved clutch, clutch operating mechanism, and safety or i0V tripping devices for disengaging the clutch operating means. These -constructions include means for compressing said discs,

consists ofA diametrically related handles adapted to be pulled toward one another to apply the clutch, and also acting as means for manually translating the spindle after power is disconnected. The handles when pulled together, also operate to set safety-trip mechanism,`which is subsequently 4operable to automatically disengage the clutch and stop determined points.

spindle translation at pre- Important features of the invention are.

the application of power atthe lowermost end of the spindle, and adjacent the lower side of the head, and the mounting of the spindle in a manner to permit application of power at the lowermost 'ortion of spindle and head whereby whippmg of the spindle "is avoided and consequent wearof parts greatly reduced. I

Another feature consists in the manner of rotating the spindle by means of a relatively a longer bearing for the spindle is obtained,

spin dle rotation and translation is provided for, the spindle being -translatably keyed to the sleeve. To this end a relatively lon sleeve is rotatably mounted `in upper an v .long sleeve slidably'keyed thereto whereby lower'bearingsof the head, the lower bearl ing being immediately adjacent of the lower wall of the head at a point beldw the level of the arm. The driving gear for the spindle 'is attached to the sleeve adjacentthe lower end of the sleeve, at the lowermost level, intermediate thesleeve supporting bearings, and therefore immediately adjacentthe lower bearing. j

,Another object of the .invention is to pro#` r vide a balanced head, the head and mechanisin therein being so arranged that undue torsional` strain upon the armis avoided. p

This object is accomplished by providing a sectional head composed of frame or casmg sect1ons arranged 1n balanced relatlon, 1n

front, beneath,-and` at the rear ofthe rail, one of said sections being slidably attached upon the rail, and the various mechanisms pro ortioned for balanced relation therein.

A eature of this improvement .also relates Another object of the invention is proto the mounting and various mechanisms in the form Iof detachable units within the frame sections of the head Another feature of the invention is the application ofpower to the spindle at a point below the level of the arm, and at the lowest possible point ofthe spindle.

vision of an improved selective shifting mechanism, operable from the front of the head,'for vshifting the speed change gears of the spindle driving mechanism. This mechanism includes means for selectivelyl shifting the gears, as well as means for alternately safety-locking the shifter members.

Another object of the invention is the provision of an improved speed change mechanism for varying the' speed'of spindle transi lation', said mechanism being'located at a point intermediate the spindle-rotating sleeve and my improved clutch mechanism. The drivingelement of the speed change mechanism 1s in geared connection with the sleeve, and the; drivenelement is connected `by intermediate shafts with the driving element of the clutchr These intermediate shafts are provided` with a clutch for cou'- pling and uncoupl-ing the shafts. The improved mechanism includes means forvselectively obtaining spindle translative speeds in .geometrical progression, the means being controllable from the front of the head by .a lever, having -a pointer adapted to ride 'over a dial, which dial has thereon characters indicative of speeds obtainable for a given setting. The. arrangement of the gears is such that constant speed ratio is maintained v between rotative and translative movements of the spindle.`

Another object of the invention is to provide a force-feed gravity lubricating system,

' operable to deliver oil at the top of the casmechanisms," the ings of the head 'and above the various indle casing being providedl with arelative superposed reservoir, one at' the top a receiving reservoir' adapted to discharge oil upon the upper end of the spindle and into the lower auxiliaryv reservoir,'which reservoir is adapted to over.-

' flow at one side and splash lubricate the' mechanism therebelow.K The lower reservoir has 'a drain opening therein,.and the casing there-adjacent has a sight opening, permit'- ting a view of the interior of the lowercreservoir, so 'that when the supply thereto-is interrupted, the same willempty by the drain-opening, this condition being observ able through the sight opening. .Y

Another object is to provide a hollow head for drill-ing machinjehaving means therein for lubricating the mechanism, said Ameans comprising a pump operated by a portion ofthe mechanism, lying at .the bottom of the reservoir and connected at its output side by suitable conduit, discharging the rail.

" feed of the spindle.

at the upper part of the head into a receiv-V ing reservoir forming one of a series of vertically alignedreservoirs w1th1n the casing,

k`the`oil being delivered in cascade from one reservoir to another and thence downwardly to the mechanism therebeneath. This lubrieating system in conjunction with the U- shaped underslung head for containing the mechanism forms an important feature of the 1nvent1on'. f

1. Other features of the invention relate to the arrangement of the operating levers at the front side of thehead, where the same maybe conveniently manipulated, and to the application of power to the spindle adja-v cent the working end thereof.- l y Other objects and Vcertain advantages'will e pointed out in the description vof the drawings forming a part of this specifica-` tion, and in said drawings:

Figure 1 is a side view of the head with the rail shown in phantom lines, withjthe means for hand translation. of the head upon the rail shown in section.

Figure 2 is a top plan view of the head with the rail shown in phantom lines, andl A positioned near the outer end of the head Figure 3 isa plan section of the head taken `approximately on the line 3 3, of

Figure 7 is a vertical transverse section 'of'the .mechanism rfor limiting tle depth Figure 8 is a horizontal section through Figure 9 is a vertical transverse sectionA through the spindle depth limit mechanismx Figure 10 is a section' at right angles to Fi 9 on line 10 10 of that figure.

i'gure 11 is an enlarged detail of thetrip mechanism for limiting translative feed movement of the spindle, shown in its tripf position.

Figure 12 is a plan section showing the Are--l lations of portions of the automatic throwout lor safety trip mechanism for limiting translative movement and Figure 13 is a view on line 13 13 of Fig;' 11.

the spindle and balancetherefor, on theline llO depth-feed of the n similar to Figure 12,

Figure' 14 is a vertical section on line 14-14, of Fig. 3, showing a portion of the transmission mechanism,

'F ig. 15 viewed from the front.

Figure 18 is a horizontal sectional view through the` worm and clutch mechanism.

Figure 19 is a vertical sectional view on line 19-19 ofv Fig. 18.

Figure 20 is a detail horizontal sectional view of the clamping mechanism for the dial.

Figure 21 is a section through the clutch shifting mechanism for the power control .of the spindle feed or translation.

Figure 22 is a diagrammatic view of the translative spindle feed speed-change mechamsm.

Figures 23 to .27 inclusive, are diagrammatic views illustrating the spindle rotation speed-change mechanism.

Y Figure 28 is an end view of the rotative spindle speed-'change mechanism operating gear cam. l 1

Figure 29 isa vertical section on line 259-29, of Fig. 28.

Figure 30 is a horizontal section on line 30-30 of Fig. 28.

Figure 31 is a plan view of the reversing mechanism.

Figure 32 is a plan of the rotative spindle speed-change mechanism shift-ing levers.

Figure 33 is a section on line 33-33, Fig. 4.

The improved balanced head comprises a plurality of casings or separable frame sections, in whielrsections or casings are contained, in unit form, mechanisms for translatably feeding and rotating the spindle at.

varying rates of speed,

The arm of .a drilling machine is indicated by the numeral 1 and is attached in a horizontal position to the column of the machine, not herein shown. The cross section of the arm is shown in phantom lines in Fig. 1, and the arm provides upper and lowerconvergently related slideways engaged with respective upper and lowe'r slideways 2 and 3 of the L-shaped casing 5, which casing contains in its lower and forward portion the spindle and balancing mechanism therefor, and spindle transmission mechanism. Means for manually translating the head upon the arm areprovided, the same consisting of a hand-wheel 10 attached at the outer end of shaft v11. said shaft having at the inner end a spiralgear 12 meshing with a companion spiral gear 13, upon a horizontally disposed rotatable shaft 14 mounted in a separable casting 15, suitably bolted to the L-shaped casing or housing 5. At the rear end of the shaft 14 is a .spur gear 16 meshing with a rack 17, said rack attached within a horizontal groove of the arm 1, see Fig. 5.

At the rear of the casing 5, as a part of the upper slideway 2, is a clamp plate 21 engageable with the upper way of the arm l and designed to clam J the head to the arm by operating lever 25,a detailed description of which clamping action is omitted.

The balanced head is slidable upon the arm, is of U-shaped configuration, and has mounted in the vertical limb thereof at the front side of the arm, a spindle, and mechanism for rotating and translating the spindle, and has mounted in the opposite parallel vertical limb at the opposite -sideof the arm, reversing and transmission mechanism', and has in addition intermediate speed change mechanism connecting said transmission mechanism with said spindle rotating mechanism, this intermediate mechanism being disposed beneath the arm. The head also comprises the L-shaped frontsection, which is adapted to be slidably .attached and engaged-with the arm, this section having a horizontal extension passing beneath and rearwardly of the arm, and having attached thereto the said upward extension lying at the rear thereof.

The main dri`ve or power shaft is indicated at 30, is horizontally disposed relative to the arm, and is in driving connection with the speed box mechanism carried at the inner end of the arm adjacent the column, said box not herein being shown. The shaft 30, which will hereinafter be referred to as the power shaft, is of castellated construction, the castellations being engaged with the bevel gears 31, 32 of the reversing mechanism mounted in, casing 40 of the head, seel Figs. 4 and 31. The bevel gears are slidable with the hea'd and upon the shaft 30. The reversing mechanism shown in Fig. 31 comprises, in addition to the bevel gears above mentioned, a third bevel gear 35 in constant mesh with said gears 31, 32, providing means whereby Irotative motion in either direction may be commun.

cated to vertical drive shaft 36 mounted in the housing or casings 5 and 40 of the head. The shaft 36 is supported at its upper end in ball bearing 45 and at its lower end in .ball bearing 46 and has mounted thereon, in addition to the bevel gear 35, the upper cluster comprising the two gears 4T. 48, said gears being translatably engaged` with the castellations 55 of )the sha-ft The lower end of the shaft has rotatively mounted 125 by means of teeth' `53 withthe lowerend of the upper 'cluster vcomprising the gears at opposite sides of the rod 66 are shifterv forks 68, 69, adapted to operate suitable l47, 48. y. Engaged with-gear 48 of the u per cluster is a shifter fork 56 extending om the shifter sleeve 57 splined as at 58 to the sleeve 59, which sleeve 59 is non-rotatably fixed in upper and lower bearings and has rotatably mounted therein a vertical shifter shaft 60 parallel with and located rearwardly of the shaft 36. The sleeve 59 is held stationary in its bearings by the screw 61 and forms a bearing for the shaft 60. At the upper end of saidshaft 60 is attached a shifter arm 62, the outer notched end of which engages a pin 63 of a block 64 pinned to a translatable rod 66 mounted in bearings 67 in the top of the casing 40. 1 Attached clutches for alternately engaging com'panion clutches of the bevel gears 31, 32, to cause the rotation of said gears with said power shaft, by which means the rotation of the shaft 36 may be reversed by manipulating the hand lever 70 attached to the lower end of the shaft 60. A detailed description of the reversing mechanism is not herein given inasmuchv as the same forms the subject matter of a copending application for reversing gearing, filed March 23, 1922, Serial No. 546,137, to which application the'reader 1s referred. The gears 51, 52, as a vcluster are shiftable by the shifter fork 54 extending from a shifter sleeve 65, which sleeve is slidably keyed as at 71' to the bearing sleeve 59. The gears 51, 52, are engageable with gears 72, 73, as a cluster mounted upon a short shaft 74, stepped in ball bearings 75 in-the frame 5,- said gears 72, 73, being intermediate between the companion vgears upon sleeve 50, and the drive gear nonrotatably attached to the rotatably mounted spindle-operating sleeve 81 surrounding the spindle 82, and splined or slidably keyed thereto by means of the diametrically related longitudinal grooves 76. This splined connection permits translative motion of the spindle within the sleeve 81, said spindle being rotated by the sleeve through means of the gear 80. The gear 80 is located ad- ]acent the lower end of the spindle and at alevel beneath that of the rail, thus applying power to the spindle at the nearest possible point, relative to the tool and Work, andproviding a very strong structure.

, The sleeve 81 is counterturned to provide a shoulder below the gear 80, against which shoulder is engaged one element of a ball bearing 83, the outer element of which beari `ing is engaged within a cavity of an annulthe sleeve'81, spindle bearing and spindle.

larvbearing block 85 disposed at the lower .end of the casing, extending upwardly 'therethrough and held non-rotatively there- Within.

This block is removably attached to the casing by the screw 86, permitting to. be vconvenien tly removed. The 4spindle with 4diametrically related notches 92 in' the circumferential flange 93 of the sleeve 81, b Which'means the gear and sleeve are positively locked to rotate in unison. The

sleeve is supported at its upper end in the ball bearing 94, andv is provided at the upper extremity on its upper periphery with the spur teeth 95, which teeth are operably engaged with the teeth of'companion spur gea 96 as the irst gear of -a translative spi dle feed speed-change mechanism, described in detail under the heading, Speedchange mechanism for spindle translation.

As before stated, the spindle 82 isslidably keyed to the sleeve, and the power to the spindle is received through the sleeve, both for translating and rotating the same. The upper end of the spindle is rotatable withinv a tubular rack sleeve 105 slidably but nonrotatably in the bearing sleeve 100. The upper end of the spindle is 'counterturned to provide a reduced upward extension 101, and to provide a shoulder 102, against which and about the counterturned portion is placedy a ball bearing 103 as a thrust bearing'. Engaged with the upper end of the thrust bearing, surrounding the reduced counterturned portion 101 of` the spindle, and engagedwith and rotative upon upper and lower bearing bushings, thereon, is the rack sleeve 105 having horizontally disposed segmental rack teeth 106. The sleeve has at its upper end the flanged bearing bushing 107 engaged and retained by washer and cap nut. The rack sleeve is translatably and non-rotatably held, and the bearing sleeve is locked within the frame (see Fig. 8) by the dog-point screw 109, the point of which engages a groove 108 of the rack sleeve, with the shank traversing the wall of the bearing sleeve. This construction provides for the rotation of the spindle, within the sleeve 105 and for the translation of vthe sleeve without rotation. VThus the l spindle may rotate within the rack sleeve while the same is being translated by the mechanism now to be described.

Speed change mechanism for spi/Mlle translation.

Mechanism for causing translative movement of the spindle and for varying its speed of translation comprises the following elements, the speed change portion of the mechanism being mounted in a detachable frame,

end of shaft 110 mounted in upper and lower ball bearings 111, 112 of a frame unit 143" vhandle 133, and a pointer thereon.

attached to the casing 6, in turn detachably bolted to casing 5. The shaft is counter- `turned, shouldered and castellated to provide for the proper mounting ofdrive and clutch mechanism, now to be described.

Below the gear 96 and upper bearing 11, mounted upon the shaft and engaged against a shoulder 113 thereof, is rotatively mounted upon a retaining` bushing pinned to the shaft, a spur gear 115 as a sleeve gear, having clutch teeth 116 engageable with corresponding teeth 117 of a shiftable-double faced clutch member 118 splined to the central castellations 119 of the shaft. The opposite clutch teeth 120 of member 118 are engageable with companion clutch teeth 121 of the spur gear 122, rotatively mounted upon the bushing 123 surrounding the shaft, the said bushing being non-translatable and engaged at one end against a shoulder 124, and at the opposite end engaged by one element of the lower ball bearing 112. The gears'115, 122, as speed multipliers or reducers maybe caused to rotate with the shaft and Ytransmit power as herebelowv described, when either is engaged by the clutch. Upon the outer periphery of the clutch member 118 are circumferential rack teeth 130 engaged by the teeth of a segmental gear 131 mounted upon the shaft 132 held in suitable bearings and having at its outer endrha e pointer overlies the dial plate 134, upon which dial plate are characters, in this instance A, B, indicative of the positions of the clutch.

Mounted in parallel relation to the shaft 110 and spaced therefrom is a castellated shaft`140 mounted in 'upper and lower bearings 141, 142, carried'by the frame 143. Upon the shaft 140 are arranged vertically, one over the other, a series ofspur gears, the to gear 145 of the series being in mesh with t e spur gear 115, and the bottom gear 146 4of the series beingin mesh with the spur gear 122. Intermediate the gears 145, 146 are the gears numbered respectively 147, 148, 149 and 150. Rotatahlv mounted in parallel relation with the castellated shaft 140 and spaced therefrom, is a tubular shaft 150 held in upper and lower bearings 151, 152, and having formed thereon at its lower, end a bevel gear 153 meshing with the companion gear 154 attached to a horizontal stub shaft 155 mounted in the hanger bearing 156 at the bottom of the frame 143.

gear 165 being atthebo'ttom and meshing with the gear 146. Set Within depressions in the upper faces of the gears 161 to 165, inclusive, are rings 166, Which function as spacers, each ring having a circular oil groove in its face, communicating with openings, traversing the ring. These openings communicate with corresponding openings of the gears, whereby oilV is delivered to all wearing parts. Slidably mounted within the bore of the sleeve shaft 150-is a plunger 17 0 having at its upper end circum ferential rack teeth 171, engaged bythe spur wheel 172 mounted upon the horizontal operating shaft 163, at the outer end of which is the operating lever 174 having a pointer riding over a dial 174a as inthe case of the lever 133.

Suitable characters are placed on the dial indicative of the speeds correi sponding to various positions of the lever and plungerL The plunger 170 is slotted as at 175, and has pivotally mounted therein upon cross pins, outwardly springpressed pawls 176, 177. The sleeve 150 is slotted longitudinally as at 178 and the pawls are adapted to extend into, and vin certain instances, therethrough for`engagement with notches 180 0f the gears 160 to 165, inclusive, each gear having a plurality of `teeth, forming such notches. The pawls are also adapted to progressively and 'alternately engage projectionsA 181 of the rings 166, which projections extend inwardly from the bore of the ring, into the slot 178 a suflicient distance to lock the-ringsagainst rotation and to cause disengagement of the pawls from the notches 180, when the` plunger 170 is translated a proper distance conformable to the setting of thelever 174. By the arrangementl herein shown, speed changes in geometrical progression may be obtained. As shown in the drawing, if the clutch 118 is engaged with theteeth' of vthe gear 115, power will be transmitted to 'the gear 145, through the shaft to gear 146 `and to gear 165. If the clutch is engaged with the teeth of the gear 122, the speed of the gear 165 will be correspondingly changed. It will be noted one pawl is disengaged', when thel other is engaged. Thus,

when the plunger 170 and pawls 1,76, 177 are caused to travel upwardly from the position shown in Figure 22, the pawl 176 'will engage projection 181 of the. ring 166 immediately aboye, pulling the pawl from engagement with thel notchof gear 165, while the pawl 177 will engage the notch of the gear 162.

vA speed change mechanism is thus provided, having' two series of gears rotativelyv mounted, the pitch of successive gears of one series beingprogressively increased over thatfofl the corresponding gears of the other series. -Means lis provided which is adapted to be successively engaged and disengaged v l l I Power and @hatch mechanism the other series, whereby one ofthe ele-A ments, in this instance a pawl, is always engaged with a gearof one of the series to lockthe same'for rotation, when the other is disengaged from the corresponding gear of the otherseries, whereby the successive alternate engagement and disengagement of the pawls causes gradual increase or decrease of speed change ratios, according to the direction of translation of a translatable plunger, carrying the pawls,

for spindle translation.

Cooperable with the clutch head or member 157 is a companion clutch member 190 slidable upon the castellations at the extremity of the horizontal shaft 191 suitably rotatively held in bearings of the frame 6 (see Fig. 16). At the outer side of the frame or casing 6 and mounted in the handwheel 192, is a thrust bearing 193 engaging the side of the frame. Upon the shaft 191, intermediate its bearings, is pinned a Worm gear 195 adapted to mesh with the companion Worm gear 196 mounted for rotation in a vertical plane and held for such rotation as at 197 in the frame 6 (see Figs. 3, 7, 9, 10).

The Worm Wheel 196, as a spindle translating drive gear, is adapted for manualrotation by the wheel192 when the clutch 190 is disengaged from the clutch member 157, as shown in Figure 16. The disengagement of the clutch 190 is obtained (see Figure 21) by the operating lever ,200 mounted upon a shaft 201 held horizontally in suitable bearings inthe frame 6, said shaft having at its inner end a crank 202, and a shoe 203 at the -outer end of said crank engaged with the groove of the clutch 190. When the clutch 190 is engaged with the clutch 157,- the worm` is conditioned for rotation by power through.

the speed change mechanism hereinbefore described. The gear 196 is provided With a hub extension having its outer surface engaged with the corresponding inner bearing surface of a circular cavity formed in the frame 6, and the worm gear is thus mounted for rotation. The bore of the worm gear is provided with teeth,` with which are non-rotatably engaged clutch discs 205 .alternating with clutch discs 206, in turn non-rotatably attached to the Ibushing or sleeve 207, having at-one end a circular radial flange 208, and provided with exterionteeth with which the discs 206 are engaged. The sleeve is slidably keyed as at 209 to a cylindrical extension 211 of the cylindrical head 210, mounted rotatably within the frame 6 and held from lateral .movement therein, through its connection .y with gear 212. The head has mechanism 'any point between such lilmts.

therein for manually transmittingly engaging and for automatically releasing or disengaging the clutch discs 205, 206, at the limit of spindle translation in both directions, to prevent overtranslation of the spindle .in either direction, and for obtaining automatic discontinuance of spindle feed at disc 206 of one series engages or is engaged with the flange 208 and the inner disc 205 of the other series is engaged/or is engageable with the face of thel spur gear 212 clutched by projections 213 to, and rotatable with, vthe cylindrical extension of the head 210. The teeth or projections are carried by a sleeve extension of the gear, which extension is exteriorly threaded as at 227,

The last and a nut 228, in the form of a spur gear is in threaded engagement with the threads of said extension. One face of the gear or nut engages the end face of the cylindrical extension of the head, and by rotating the nut the distance between the opposing face of the gear 212 and head 210 may be varied to correspondingly 'allow decreased or increased `t row or translation of the sleeve 207. The spur gear 212 is in mesh 'with intermediate spur gear 215 mounted upon a shaft 217 -which is held in suitablel ball bearings 216 within frame 6 (see Figs. 4`

and 7). Meshing with the l gear 215 is a spur gear 218 attached at the outer end of the horizontal shaft 219 held in bearings of the frame 20, and upon said shaft 219 is a pinion 220 in mesh with the teeth 106 ofv vthe sleeve 105. Poweris thus transmitted l through the Worm 196 to the spindle for vertically translating the same.

Parallel with the spindle-and slidable in bearings in thecasings 5 and 20, at the opposite side ofthe gear 219 is a cylindrical member22l, as a spindle balancing member, Y

having -rackteeth 222 engaged with the pinion 220. rlfhe member. 221.1is keyed as at. 225, (see Figure 8), against rotation, 'but isn slidable in its bearing.. vThe gear gagedwith the spindle 231, which forms a tubular bearing for the gear, said bearings* being supported for rotation 'at'pne .end in bearings 270 of the frame 6, and at the other inV the-` cavity or bore of the cylindrical extension of the. head. "Ilhe gear 212 abuts the inner member of the ballbearing support 27 0, and this element receives the thrust I ofthe gear when the discs are thrown against the opposite face of said gear during clutching operation.

' The head, gear, translatable flanged sleeve, and discs carried thereby, are `rotatable as 212' is rotatably' mi' siidabiy. eil-.'11

a unit. The .head/210 and gear 212, as be'v fore statedare translatable with respect to one another and this translation is obtained by rotating the nut 228 by means of a inion 229 (see Fig. 1 0) mounted on as aftn held for rotation in the gear 212 and head the notches 262 with the levers, said levers 210 and slidably traversing the slidable ele'- may be brought together to apply pressure ment 207. The head is bored, inwardly to the discs. Within the bore of the arbor from its front face to provide for the intro- 231 in translatably and rotatably mounted a duction of a tool, such as a screwdriver, a shaft 271 shouldered as at 272 to provide a slot being provided in the shaft for engagestop for limiting outward movement of the ment by such a tool to rotate the pinion 229. shaft. The outer headend or extremity ot' Referring particularly to Figures 18 and the shaft 271 is provided with circumferen- 19 the head is bored longitudinally at diatial teeth 273, said teeth engaging corremetrically opposite points, to provide for sponding teeth 27 et of the levers 251. lVhen the'introduction of set screws l240 in this the Ilevers vare brought together from a posiinstance 4 in number. The inner ends of tion shown in Figure 7, the shaft is transthese screws are in threaded engagement lated inwardly disposing its opposite ex- With the gear 212, and slidably traverse the tremity beyond the arbor as shown in Figelements 207, 210, which former element is ures 9 and 10.

counter-bored concentrically with the bores Pivoted as at 280 at the rear of the gear of thescrews to provide a soclfet in which, 212 upon the frame-6 (see Figures 3, 7, 9, and surrounding the adjusting screw, isv al 10, 11, 12, 13) is a trip lever 281 having at coil spring 245 having its opposite end reits upper end the adjustable pin' 282 adapted spectively enga ing the gear and .end wall for lengagement with the end of the shaft v of the socket. reliminary to adjusting the 271 to throw the same outwardly from podistance between the head and the gear, the sition shown inFigure 9, a spring 283 bescrews 240 are rotated in an appropriate diing interposed between the end of said lever rection, the springs 245 always acting to 281 and the socketed end of the arbor 281 for pressr the element 208 toward the head. normally .holding t-he upper end of said After properly adjusting the screws, `"the lever away` from the end ofshaft 271. At pinion 229 is rotated in an appropriate dithe lower end of .the lever isl pivoted .as at rection, either to lincrease or decrease the 285, a latCh 286 having the teeth 287, 288 11- distance between head and ear and the gageable under certain Conditions by the screws 245 are then tightenedi 228 against the outer face extension 211.

Description follows of the mechanism for has the spring pressed detent 290 engageable applying pressure to the clutch discs, and alternately with the notches 291, 292, where'- lfor maintainingV the pressure until the b y the latilflly be Set in tW0 .angular Telaspindle has reached its limit of translation vtlOIlS I'elfltlVe `t0 its SuppOrt nd'tO lug 289.

in either direction, afterv which the pressure lnward movement of the trip lever is adis automatically released and spindle feed Justably limited by the stop 293, the conical discontinued. end of which is engageable by the lower end .Automatic safety-limit clutch throw-out Pivoted as at 249 within a diametric slot most position the teeth of the latch 28.6are

levers 251 having knobbed handles 252, said gaged. Whenever the spindle reaches eitler handles extending outwardly at one side of Aof the limit-s of translative' .movenientftliisqll to hold nut lug 289 projecting .horizontally from the outer face of the gear 212. lThe latch 286.

of pivot 285. Wit-h the spindle in its lowerdisposed as shownin Figure 13,v in which position the .hand levers 251 are' locked, as 250 of the head 210 are diametrically related ShOWIi f1'I1 Elglll' 7, and the Clutch iS diSeIl? im, i

the pivots. Each lever has a roller r2541 locking action OCCHIS." When .the Spindle iS pivoted to a relatively short arm at opposite ltravelillp; downwardly, "the gear 212 -rotates side of the pivot 249. The rollers are enfin counterlclockwise direction, and when the gageable with diametrically related bosses Sfiindle travels-in the opposite -di'lCtiOIl the 255 of the bushing or sleeve 207, and by Said gear is Correspondiligly'lieTSed:` i

bringing the lever handles together as shown BefOie the 'CllltCh C2111 again. ble thI'OWIl in 1n .Figures 9 and 10 the. bushing [is trans-V by pulling -'the levers toward' one another lated, and the discs frictionally engagedfor fI'OIlTthB pOSitiOIl ShWIl /iIl Figure 7; the transmittmgly clutching the worm whee1196 handles must be grasped and the head 210 with the spur gear 212. This clutching acrotated for suilicien't distance in the direction is made against the action of the springs tiOn OPPSitS that ill WhiCll' the head Was 245. Means for lockins.T the levers in Inontraveling to disengage theilug 289-from the clutching or initial position as shown in tootli 2F88. .For example, if the lug has been Figure 7, comprises a circular latch 260 pivtraveling in the direction/ indicated by aroted as at 261 which latch has diametrically row a of Figure 13, and has arrived at the related notches 262 in its periphery. When position shown, it vWill be necessary to re-v the'latch is turned to the position shown leasel'the same from engagement with the in Figure 6, the levers cannot be brought -tooth of the latch lever by moving the lug together, but when the latch is turned at a a short distance in the direction indicated right angle at the position shown to align by the dotted arrowhafter which the clutch may be thrown in and the drive. mechanism reversed, which reversal will cause rotation vof the gear in` direction indicated by 'the arrow Z, and the spindle will begin its upward travel. The drive worm 196 rotates in counter-clockwise direction to feed the spindle downwardly, but whatever the direction of spindle travel the gear 212, when the clutch is engaged, makes two complete revolutions before the trip lever is thrown. Figure 12 represents the position of the teeth of the latch 286 relative to the lug 289 as said lug approaches the latch after the gear has completed its first revolution during the travel of the spindle in downward direction from its uppermost position.v Upon further movement in anti-clockwise direction from the position shown in Figure 12, the lug 289 will engage the tooth 287 and throw the latch to a position shown in Figure 13, but without operating the trip lever. After throwing the latch, the gear continues its travel in the same direction and completes a""second revolution, at the end of whichthe lug engages the tooth 288 as in lFigure 13, which tooth has previously been thrown into its path,` pushing the lower end of the trip lever'281 outwardlyand causing the pin 282 -to engage the end of the shaft 271 as shown in. Figure 11, thus releasing the clutch and returning the hand levers 251 to the position shownin the Figure 7. The mechanism will be stopped in this position and will remain locked until the hand levers are grasped and the head is turned slight-ly in clockwise direction to release the trip lever and permitthe shaft 71 to slide rearwardly, and allow the levers 'to be one another to clutchin after thepower has -been reversed by operating the reverse lever 70, to change the direction of rotation of the worm gear 196. When the direction of rotation has been changed thus, movements of thel latch 286 will take place in reverse order.

The abovedescribed mechanism is inthe nature of a safety device to prevent overtranslation of the spindle in either directions A mechanism is also provided for automatically throwing out the clutch to positively discontinue spindletranslation at any position between its translative limits, a description of which mechanism follows:

Automatic spimlle depth4 feed ,Zfmtz'ng The purposesv'ozt1 the following described mechanism are to .obtain a predetermined length of translativefeed'movement of the spindle to feed the'tool into the work a pre'- determinedddepth, and to automatically sto the feed when the tool has reached suc depth. The device provides mechanism which may be manually setto accomplish the' latter operation automatically; j L

pulled towardv -face of lever and Pivoted as at 299, within a radial slot 300 'of the head 210 is a lever 301 having its ingaged within a diametric slot 302 of the shaft 271. TheA outer end of the lever is' chambered convergently at opposite sides, as best shown in Figure 19, to form cam faces 303 engageable with the projectingend of a pin 304 correspondingly ehamfered as at 305 and slidable in a radial bore 306, in an angular adjustable dial member 295. A set screw 307 traverses a` slot `308 of the dial, and has threaded connection with the pin 304, whereby said pin'may be adjusted inwardlv or outwardly, respectively into and out of the path of rotation of the lever, and immovably set in such adjusted position. The pin as shown in Figure 10 is in tripping position.

The circular dial 295 is mounted at the front of the frame 6, concentrically with and rotatable upon the head 210 and within the depression 294 of the frame. The head has marginal graduations 296 thereon, said graduations being numberedvin correspondence to the length of the desired translative spindle feed in inches, whereby when4 a given graduation is made. to correspond with the zero mark 297 of the head, the pin 304 will be so positioned that the shaft 271 will be tripped, and clutch discs released, to stop spindle translation at a oint corresponding to the dial setting. or example, when the dial is set with the numeral 6 opposite the zero mark of the head, and the handles are brought toward one another to throw the clutch in, the spindle will be fed downwardly 6 inches and when it has travleled that distance itsmtion will'- be automatically arrested. ,This automaticy arrest of the spindle feed is accomplished through the translation of the shaft 271, which disvThis places the pinin a determined angular relation to the lever, after which the dial member is clamped against 'further rotation p by lever l325.

To start translative spindle feed, the levers are *then pulled to positionu shown in Figure 9 and head 10 begins to rotate, if feed clutcli`l90 is engaged.` When suiiicient rotation has taken place in conformity to the setting of t-he` dial, the chamfered surpin, will engage'. The lever will be thrown 1n counter-clockwise direction, see Figure 10, the plunger will be translated to,l the yright, separating andthrowing handles toI initial position. 

